Part of it is because this is a one of a kind with no transformers, no coupling caps. Well, there was the Futterman OTL from Cavalli which I assume only had interstage coupling caps. We just don't have much to compare the Folkvangr to because so much contributes to the sound. The white-cathode follower has a sound. The type tubes have a sound. The high plate resistance of the tubes will have an effect which will result in sound. What is mistakable is that the Folkvangr has a sound which I think @roshambo123 and I have tried to describe. Valhalla 2 is a good place to start. Folkvangr is a Valhalla 2 with moar output devices and without the coupling caps. While we can argue that perhaps Valhalla 2 can be improved with audiophile boutique coupling caps, with maybe the big oil cans used on the EC ZDS - this would not only break the price point but also the form factor. Basically add balls and drive to Valhalla 2, remove the veil, and smooth out the highs, while keeping the soul of the Valhalla 2, and voila Folkvangr. I would say that the results, very positive effects, were unexpected.